Tuyere



0. R. RICE Nov. 10, 1936.

TUYERE Original Filed 001:. 22, 1954 2 Sheets-Sheet 1 INVENTOR OWEN RRicE.

' -w 7 rmzim 0. R. RICE Nov. 10, 1936.

TUYERE Original Filed Oct. 22 1934 2 Shegats-Sheed 2 INVENTOR. OWEN BRicE.

Q I BY I wM/A Z Patented 1 Nov. 10, 1936 PATENT OFFICE TUYEBE Owen R. Rice, Chicago, 111., assignor to Freyn Engineering Company, Chicago, Ill., a corporation of Maine Original application October 22, 1934, Serial No. 749,371. Divided and this application May 2, 1935, Serial No. 19,431

4 Claims. (01. 266-41) The resent invention relates to improvements in m beds of casting. I

More particularly the present invention relates to the method of casting rigid blocks within metal having a different coefllcient of expansion than said blocks. The, presentinvention is particularly useful in the manufacture of tuyres having refractory noses, and will be described in connection with tuyeres.

This application is a division of application Serial No. 749,371, filed October 22, 1934, by the present applicant.

An object of the present invention is to simplify the manufacture of castings having preformed rigid blocks located therein;

A further object is. to 'provide an improved method of making a casting having a circular assembly of preformed blocks located therein.

' A further object is to provide an improved method of making a .tuyre embodying preformed refractory blocks in the nose thereof.

Further objects will appear as the description proceeds.

Referring to the drawings- Figure 1 is a view in end elevation showing the nose portion of a tuyere embodying the principles of the present invention, illustrating particularly the disposition of refractory blocks within the nose portion of the tuyere;

Figure 2 a fragmentary sectional view taken along the plane indicated by the arrows 2-2 of Figure Figure 3 is a view similar to Figure 2 but showing an alternative construction for holding the refractory blocks in place; 7

Figures 4 and 5 are views in end elevation and side elevation, respectively, of the block appearing in Figure 2;

Figure 6 is a view in end elevation of the block appearing in Figure 3; r

Figure 7 is a fragmentary view similar to Figure 1 but showing the arrangement of preformed refractory blocks for a different diameter of tuyre;

Figure 8 shows the arrangement ofblocks for another diameter of tuyere; r

Figure 9 shows the arrangement of blocks for another diameter of tuyere;

Figure 10 shows the arrangement of blocks for still another diameter of tuyere;

Figure -11 illustrates the method of spacing he refractory blocks preparatory to the operation of casting the tuyre;

Figure 12 is a fragmentary elevational view of the structure shown in Figure 11; v

Figure 13 is a view illustrating how a portion of a. shim may remain after the casting operatmn; and

Figure 14 is afra'gmentary elevational view of the structure shown in Figure 13.

The present invention has been illustrated in connection with a tuyere of the type generally known as water-cooled. By reference to Figure 2 it will be noted that the tuyre comprisrs the inner cone wall ID, the outer cone wall II, and the front wall l2. Said walls, together with a back wall (not illustrated) form a jacket for cooling medium, usually water, through which the cooling medium may fiow in a continuous stream to carry away heat from themetal of the tuyere. Extending forwardly from the front wall H are the inner annular rib or fin l3 and the outer annular rib or fin H, which ribs or fins l3 and it are disposed coaxially of the tuyere. In the outwardly opening recess between the front wall I2 and the annular ribs I3 and I l are a plurality'of preformed segmental blocks |5-.| 5, which blocks,

in order that they may fit approximately around. the circumference of.- a circle, have side faces ,tenon I6 is provided, which tenon extends circumferentially of the tuyre in the space provided by the wall l2 and the fannular ribs or fins l3 and I4.

In the construction illustrated in Figure 3, the faces of the refractory blocks I 5l 5 which face'the axis of the tuyere are provided with a pairofholes I 'l-I1. These holes are disposed at an angle one to the other so that when they are filled up with copper in the casting operation 'to form lugs, indicated by the numerals Ila-Ila, the blocks are held firmly in a manner comparable to the -toe-nailing of a board. In either of the constructions illustrated in Figures 2 and 3, the copper side walls or ribs -I3-and It may burn away in service, but the blocks are securely held either by the tenon IE or thelugs l1a|la within the holes l1l1, which tenons or lugs are themselves an intimate part of the cool water wall of the tuyerebody. In-the construction illustrated in Figure 3, a vent I 8 is provided communicating with each pairof holes ll-l'l, whereby to facilitate, the casting operation- In casting copper about a preformed rigid core, dimculty will be encountered in the case of certain preferred refractory cores due to the tendency of the copper to split upon cooling. This is because the coeflicient of expansion of copper is higher than that of the preformed core. Moreover, since tuyeres are made in many sizes, it would be necessary to have on hand many sizes of cores. In order to simplify the matter of stocking cores, and for the further purpose of overcoming the difficulty of splitting of the copper upon cooling, the present invention contemplates the use of a plurality of segmental preformed blocks which can be disposed circularly to form a core of any preferred diameter, within limits. Figure 1 shows a core made up of nine full blocks l5 .and one cut block, the cut block being indicated by the numeral [9. In the operation of casting the tuyere, shims 20-20 (Fig. 11) of volatile substance, such as wood or paper, may be located between the blocks to permit the copper to contract upon cooling. The fact that the adjacent sides of the blocks do not make flat contact in certain cases is of no consequence. These spaces will be filled with intrusions or fins of cast copper, indicated by the numerals 2I-2| (Fig. 13), which will serve the better to hold the blocks in place. In case the shims are not completely volatilized, no harm will result. Fragments of such shims are indicated by the numerals Illa-20a in Figure 13.

Figures 7, 8, 9. and indicate relative positions of blocks such as shown in Figure 1, but for tuyres of diiIerent diameters.

By reason of the fact that the refractory is cast within the tuyere in the form of a plurality of preformed blocks, it is a simple matter to provide for the casting of different sizes of tuyeres as required, and, further, it is a simple matter to provide for the differences in the coefllcient of expansion of the copper and the blocks, whereby the blocks may move in the cooling operation to allow contraction of the copper while cooling, whereby to avoid splitting of the copper.

The present disclosure is of course subject to modification. It is intended to cover all such modifications that fall within the scope of the appended claims.

What is claimed is- 1. The method of making a casting having rigid blocks therein which consists of disposing said blocks in proximity to one another but spacing them apart with volatile solid material and casting the molten metal about said rigid blocks and said volatile solid material.

2. The method of making a casting having a circular assembly of rigid blocks'therein which consists in setting up a plurality of such blocks in a circular formation, spacing said blocks apart by means of volatile solid material, and casting the molten metal about said blocks and said volatile solid material.

3. The method of making a blast furnace tuyre having a refractory nose which comprises setting up in a circular formation a plurality of rigid blocks tapering toward the axis of said circular formation, spacing said blocks apart by means of solid material volatile in molten metal, and casting molten metal around said rigid blocks and said volatile solid material.

4. The method of forming a tuyere having a refractory nose which comprises setting up a plurality of refractory blocks in a circular formation while spacing said blocks apart by means of volatile solid material and casting the nose portion of said tirvere around said blocks by pouring molten metal around said blocks, keying said blocks to said nose portion in the casting operation.

OWEN R. RICE. 

